Sheet metal fuel gas burner construction



March 2, 1954 MARBLE 2,670,790

SHEET METAL FUEL GAS BURNER CONSTRUCTION Filed Nov. 7, 1949 INVENTOR H. A Marble ATTORNEYS Patented Mar. 2, 1954 SHEET METAL FUEL GAS BURNER CONSTRUCTION Harold Arthur Marble, Burlingame, Calif., as-

signor to International Sales Company, San Francisco, Calif., a corporation of California Application November 7, 1949, Serial No. 125,860 b This invention relates generally to the construction of burners suitable for use with various fuel gas burning appliances, such as natural gas domestic heating furnaces.

In general it is an object of the invention to provide a novel burner construction particularly applicable to manufacture from pressed sheet metal.

Another object of the invention is to provide an improved burner construction which can be used to advantage as a cross pilot burner for igniting a plurality of main burners.

Additional objects of the invention will appear from the following description in which the preferred embodiments of the invention have been set forth in detail in conjunction with th accompanying drawing.

Referring to the drawing:

Figure 1 is a plan view illustrating a cross pilot burner incorporating the present invention.

Figure 2 is an enlarged cross-sectional detail taken along the line 22 of Figure 1.

Figure 3 is an enlarged cross-sectional detail taken along the line 3-3 of Figure 1.

Figure 4 is an enlarged cross-sectional detail taken along the line 44 of Figure 1.

Figure 5 is a plan view illustrating a plurality of main burners assembled with the pilot burner of Figure 1 and serving to illustrate the manner in which the pilot burner is employed in practice.

boxes or combustion chambers, and are connected to a common gas supply manifold l I. Extending crosswise of the main burners, there is a cross pilot burner l2, which is designed to provide a continuous flame extending across all of the main burners.

The improved construction for the pilot burner I2 is illustrated particularly in Figures 1 to 4 inclusive. It is formed from two pieces iii of sheet metal, with each sheet being formed, as by'a pressing operation, to provide the portions l3a to He inclusive. The flat portions I3a are assembled in direct contact, and are attached together as by seam or spot welding to form in effect a fin extending along one side of the burner. Portions [3b are each semicircular in cross-sectional contour, whereby they form a lo n gitudinal passage ll. The portions 130 are 2 Claims. (Cl. 158-114) 2 spaced apart and substantially parallel, except for the areas I5 which are pressed together in direct contact and spot welded together. Portions 13d are each substantially semicircular in cross-sectional contour, whereby they form the passage I! which extends parallel to the passage I 41 These two passages are interconnected by the passages l8, formed by the spacing between the wall portions He. The portions |3e are spaced apart and flared as illustrated, to form a diverging discharge orifice I9 in the form of a slit which extends substantially the entire length of the burner. One end of the passageway I4 is closed, and the other is connected to the pipe section 2|, to which a gas supply pipe can be coupled. Both ends of the passage I! are closed, and substantially its entire length is connected to passage l 4 by the lateral passages l 8.

When gas is supplied to the passage 14 from the pipe section 2|, flow occurs through the lateral passages Hi to the smaller passage l1, and from this passage the gas is discharged through the burner slit or orifice [9. The flame produced is relatively even and unbroken for its entire length, which is attributed to the relatively uniform distribution of gas flow. The arrangement of the longitudinal passages l4 and I1, together with the lateral passages l8, contributes to this uniform flow distribution.

It will be evident from the foregoing that I have provided a pilot burner construction which is particularly adaptable for various fuel gas burning appliances, such as natural gas domestic heating furnaces. The pilot burner is of simple mechanical construction, and affords an even uniform flame which will function to ignite a plurality of main burners with a higher degree of reliability.

I claim:

1. In a cross pilot burner construction, a pair of elongated sheet metal parts, said parts each having two longitudinally extending and spaced struck out portions adapted to be brought into registry when the two parts are placed together to form two laterally spaced and longitudinally extending passages, one of said passages being greater in diameter than the other, portions of said parts being attached together to form a complete burner structure, said parts also being formed to provide spaced laterally extending connecting passages between said longitudinally extending passages and to form a substantially continuous longitudinally extending discharge slot extending coextensive with said smaller passage and communicating with one side of the same.

2. In a burner construction, a pair of elongated sheet metal parts, each of said parts being formed to provide parallel and substantially coextensive longitudinally extending struck out portions; the; depth and width" of one struck out portion being relativelysmall: compared to the depth and width of the other struck out portion, said portions being brought into registry when: the two parts are placed together to form two longitudinally extending passages, thecross-sectional area of one passage being substantially smaller than the other, the corresponding edgeportions of said parts being secured together to thereby form a complete burner structure with a fin extending along one edge of the same, the larger of the two passages being adjacent said fin, said parts being formed to provide laterally extending and longitudinally spaced fiow pas- 4. sages connecting said longitudinal passages and also being formed to provide a relatively narrow continuous slot for discharge of gas from the length of the smaller of the two passages, said slot extending along that edge of the complete burner structure which is remote from said fin, said structure: having means for connecting one end of the larger of said passages to a source of combustible gas. HAROLD ARTHUR. MARBLE References-(liter! in the file of this patent UNITED STATES PATENTS Raulston- Apr. 24, 1951 

